CN113253357B - Method and system for determining action state of target object based on light curtain - Google Patents
Method and system for determining action state of target object based on light curtain Download PDFInfo
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- CN113253357B CN113253357B CN202110335071.7A CN202110335071A CN113253357B CN 113253357 B CN113253357 B CN 113253357B CN 202110335071 A CN202110335071 A CN 202110335071A CN 113253357 B CN113253357 B CN 113253357B
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
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- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F13/00—Arrangements for obstructing or restricting traffic, e.g. gates, barricades ; Preventing passage of vehicles of selected category or dimensions
- E01F13/04—Arrangements for obstructing or restricting traffic, e.g. gates, barricades ; Preventing passage of vehicles of selected category or dimensions movable to allow or prevent passage
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Abstract
The invention discloses a method and a system for determining the action state of a target object based on a light curtain, wherein the method comprises the following steps: acquiring a first light curtain signal in a first area and a second light curtain signal in a second area in real time, and determining a first shielding area and a second shielding area according to the light curtain signals; when the number of the light spot positions in the first shielding area is larger than or equal to a first preset number threshold value, and the horizontal distance between the first central point of the first shielding area and the second central point of the second shielding area is larger than or equal to a first preset distance threshold value and smaller than or equal to a second preset distance, determining that a target object in the monitoring area enters; when the number of the continuous light spot positions in the second shielding area is larger than or equal to a second preset number threshold, tracking the target object; and determining the action state of the target object according to the position information of the second shielding area in real time. The method has high sensitivity and high cost performance, and can be well applied to the field of gates.
Description
Technical Field
The invention relates to the technical field of state monitoring at a gate, in particular to a method and a system for determining an action state of a target object based on a light curtain.
Background
The gate is a channel blocking device (channel management equipment) which is mainly applied to urban rail transit management, is used for managing people flow and standardizing pedestrian access, and is mainly applied to subway gate systems and charging ticket gate systems, so that a payment area and a non-payment area are formed. The most basic and core function is to realize that only one person can pass through at a time, and the system can be used for entrance channels in various charging and entrance guard occasions. For certain fields, monitoring of the status of a person is also required in a gate.
Therefore, a method for determining the motion state of a target object applied to a gate is needed.
Disclosure of Invention
The invention provides a method and a system for determining a target object action state based on a light curtain, which are used for solving the problem of how to determine a human body action state.
In order to solve the above-mentioned problems, according to an aspect of the present invention, there is provided a method of determining an action state of a target object based on a light curtain, the method including:
acquiring a first light curtain signal in a first area and a second light curtain signal in a second area in real time, and determining a first shielding area and a second shielding area according to the first light curtain signal and the second light curtain signal in real time;
when the number of the light spot positions in the first shielding area is larger than or equal to a first preset number threshold value, and the horizontal distance between the first central point of the first shielding area and the second central point of the second shielding area is larger than or equal to a first preset distance threshold value and smaller than or equal to a second preset distance, determining that a target object in the monitoring area enters;
when the number of the continuous light spot positions in the second shielding area is larger than or equal to a second preset number threshold, tracking the target object;
and determining the action state of the target object according to the position information of the second shielding area in real time.
Preferably, the determining, in real time, the action state of the target object according to the position information of the second shielding area includes:
if the number of the continuous light spot positions in the second shielding area is larger than or equal to a second preset number threshold value and no other shielding areas exist in the second area, determining that the target object is in a static state;
and if the number of the continuous light spot bits in the second shielding area is larger than or equal to a second preset number threshold value, and at least one shielding area comprising the number of the continuous light spot bits larger than or equal to the second preset number threshold value exists at the position of the number of the light spot bits which are horizontally spaced by at least a third preset number threshold value, determining that the target object is in a moving state.
Preferably, the first preset number threshold is 3, the second preset number threshold is 2, and the third preset number threshold is 1.
Preferably, wherein the method further comprises:
when the number of the light spot positions in the first shielding area is larger than or equal to a first preset number threshold value, and the horizontal distance between the first central point of the first shielding area and the second central point of the second shielding area is larger than or equal to a second preset distance threshold value, determining that an abnormal event exists in the monitoring area, and sending abnormal alarm information to the control terminal.
Preferably, the method utilizes a measuring grating to acquire the light curtain signal, and the light spot distance measured by the measuring grating is 3 cm.
According to another aspect of the present invention, there is provided a system for determining a target object action state based on a light curtain, the system comprising:
the shielding region determining unit is used for acquiring a first light curtain signal in the first region and a second light curtain signal in the second region in real time and determining a first shielding region and a second shielding region according to the first light curtain signal and the second light curtain signal in real time;
the target object confirmation unit is used for determining that a target object enters in the monitoring area when the number of light spot positions in the first shielding area is larger than or equal to a first preset number threshold value, and the horizontal distance between a first central point of the first shielding area and a second central point of the second shielding area is larger than or equal to a first preset distance threshold value and smaller than or equal to a second preset distance;
the judging unit is used for tracking the target object when the number of the continuous light spot positions in the second shielding area is larger than or equal to a second preset number threshold value;
and the action state determining unit is used for determining the action state of the target object according to the position information of the second shielding area in real time.
Preferably, the motion state determining unit determines, in real time, the motion state of the target object according to the position information of the second shielding area, including:
if the number of the continuous light spot positions in the second shielding area is larger than or equal to a second preset number threshold value and no other shielding areas exist in the second area, determining that the target object is in a static state;
and if the number of the continuous light spot bits in the second shielding area is larger than or equal to a second preset number threshold value, and at least one shielding area comprising the number of the continuous light spot bits larger than or equal to the second preset number threshold value exists at the position of the number of the light spot bits which are horizontally spaced by at least a third preset number threshold value, determining that the target object is in a moving state.
Preferably, the first preset number threshold is 3, the second preset number threshold is 2, and the third preset number threshold is 1.
Preferably, wherein the system further comprises:
and the abnormal event determining unit is used for determining that an abnormal event exists in the monitoring area and sending abnormal alarm information to the control terminal when the number of the light spot positions in the first shielding area is larger than or equal to a first preset number threshold value and the horizontal distance between the first central point of the first shielding area and the second central point of the second shielding area is larger than or equal to a second preset distance threshold value.
Preferably, the system acquires the light curtain signal by using a measuring grating, and the light spot distance measured by the measuring grating is 3 cm.
The invention provides a method and a system for determining the action state of a target object based on a light curtain, which are used for acquiring a first light curtain signal in a first area and a second light curtain signal in a second area in real time and determining a first shielding area and a second shielding area according to the first light curtain signal and the second light curtain signal in real time; and determining the entering of the target object and the action state of the target object according to the position relation between the first shielding area and the second shielding area and the number of light spots in the shielding area. The method can stably and efficiently judge the action state of the target object in the specific monitoring area, has high sensitivity and high cost performance, and can be well applied to the field of gates.
Drawings
Exemplary embodiments of the present invention may be more completely understood in consideration of the following drawings:
FIG. 1 is a flow chart of a method 100 for determining a target object motion state based on a light curtain in accordance with an embodiment of the present invention;
FIG. 2 is a top view of a gate applying a method for determining an operational state of a target object based on a light curtain according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a system 300 for determining an action state of a target object based on a light curtain according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flow chart of a method 100 for determining a target object motion state based on a light sheet according to an embodiment of the present invention. As shown in fig. 1, in the method for determining an action state of a target object based on a light curtain according to the embodiment of the present invention, a first light curtain signal in a first area and a second light curtain signal in a second area are obtained in real time, and a first shielding area and a second shielding area are determined according to the first light curtain signal and the second light curtain signal in real time; and determining the entering of the target object and the action state of the target object according to the position relation between the first shielding area and the second shielding area and the number of light spots in the shielding area. The method can stably and efficiently judge the action state of the target object in the specific monitoring area, has high sensitivity and high cost performance, and can be well applied to the field of gates. The method 100 for determining the action state of the target object based on the light curtain provided by the embodiment of the invention starts from step 101, acquires the first light curtain signal in the first area and the second light curtain signal in the second area in step 101 in real time, and determines the first shielding area and the second shielding area according to the first light curtain signal and the second light curtain signal in real time.
Preferably, the method utilizes a measuring grating to acquire the light curtain signal, and the light spot distance measured by the measuring grating is 3 cm.
In the invention, a first light curtain signal of a first area and a second light curtain signal in a second area are acquired in real time by utilizing a measuring grating, and a first shielding area and a second shielding area are determined according to the first light curtain signal and the second light curtain signal.
Referring to fig. 2, a top view of a gate applying a method for determining an action state of a target object based on a light curtain is shown, where Z2, Z3, and Z4 are middle gratings of a lower bridge, (may be synthesized as a section of measurement grating), Z6 is an upper handrail grating (as a section of measurement grating), Z1 is a rear grating of the lower bridge (safety grating), Z5 is a front grating of the lower bridge (safety grating), and Z7, Z8, and Z9 are a rear optocoupler, a middle optocoupler, and a front optocoupler, respectively, (optocoupler correlation points are the same as the safety grating). Wherein Z6 is located in the first area, Z2, Z3, Z4 are located in the second area, and the middle part of the gate is the monitoring area. The first light curtain signal can be obtained by utilizing Z6, and the second light curtain signal can be obtained by utilizing Z2, Z3 and Z4. The light spot distance measured by the measuring grating is 3 cm. When the target object is a person and is in the monitoring area, the first shielding area and the second shielding area can be determined. If the target object is not in the monitoring area, the first shielding area and the second shielding area are empty.
In step 102, when the number of light spot bits in the first shielding area is greater than or equal to a first preset number threshold, and the horizontal distance between the first center point of the first shielding area and the second center point of the second shielding area is greater than or equal to a first preset distance threshold and less than or equal to a second preset distance, it is determined that a target object exists in the monitoring area.
Preferably, the first preset number threshold is 3, the second preset number threshold is 2, and the third preset number threshold is 1.
In the invention, the height of a normal passing person is assumed to be more than 1.4 meters, the area for shielding Z2-Z4 is a bare part below the knee, the lateral width is 6-10cm, the area for shielding Z6 is more than the chest, and the lateral width is 10-25cm. Referring to fig. 2, if the distance between the center point of the first shielding area detected by Z6 and the center point of the second shielding area detected by Z2-Z4 is 3 or more, it is determined that a person enters the monitoring area.
In step 103, when the number of continuous light spot bits in the second shielding area is greater than or equal to a second preset number threshold, tracking the target object is performed.
In the invention, when the continuous light spot position in the second shielding area detected by Z2-Z4 is more than or equal to 2 light spots, the program judges the position of the person and starts recording and tracking the person.
In step 104, the action state of the target object is determined according to the position information of the second shielding area in real time.
Preferably, the determining, in real time, the action state of the target object according to the position information of the second shielding area includes:
if the number of the continuous light spot positions in the second shielding area is larger than or equal to a second preset number threshold value and no other shielding areas exist in the second area, determining that the target object is in a static state;
and if the number of the continuous light spot bits in the second shielding area is larger than or equal to a second preset number threshold value, and at least one shielding area comprising the number of the continuous light spot bits larger than or equal to the second preset number threshold value exists at the position of the number of the light spot bits which are horizontally spaced by at least a third preset number threshold value, determining that the target object is in a moving state.
In the present invention, as shown in fig. 2, if the number of continuous light spots in the second shielding area is detected to be 2 or more, and other areas are not shielded, it is determined that the person is located in the monitoring area and is in a stationary state.
If the number of the continuous light spot positions in the second shielding area is greater than or equal to 2 points, and another or more shielding areas comprising at least 2 continuous points exist at the positions of at least 1 point at intervals, the person is judged to be in a moving state.
Preferably, wherein the method further comprises:
when the number of the light spot positions in the first shielding area is larger than or equal to a first preset number threshold value, and the horizontal distance between the first central point of the first shielding area and the second central point of the second shielding area is larger than or equal to a second preset distance threshold value, determining that an abnormal event exists in the monitoring area, and sending abnormal alarm information to the control terminal.
The monitoring area is normally a person in the presence of a person. In order to prevent the situation that multiple persons enter simultaneously, the invention determines that an abnormal event exists in a monitoring area and sends abnormal alarm information to a control terminal when the number of light spot positions in the first shielding area is more than or equal to 3 and the horizontal distance between a first central point of the first shielding area and a second central point of the second shielding area is more than or equal to a second preset distance threshold. The second preset distance threshold can be set according to the lateral width of the human body and the light spot distance measured by the measuring grating.
Fig. 3 is a schematic structural diagram of a system 300 for determining an action state of a target object based on a light curtain according to an embodiment of the present invention. As shown in fig. 3, a system 300 for determining an action state of a target object based on a light curtain according to an embodiment of the present invention includes: occlusion region determining unit 301, target object confirming unit 302, judging unit 303, and action state determining unit 304.
Preferably, the occlusion region determining unit 301 is configured to obtain a first light curtain signal in the first region and a second light curtain signal in the second region in real time, and determine the first occlusion region and the second occlusion region according to the first light curtain signal and the second light curtain signal in real time.
Preferably, the system acquires the light curtain signal by using a measuring grating, and the light spot distance measured by the measuring grating is 3 cm.
Preferably, the target object confirmation unit 302 is configured to determine that the target object enters in the monitored area when the number of light spot bits in the first shielding area is greater than or equal to a first preset number threshold, and a horizontal distance between a first center point of the first shielding area and a second center point of the second shielding area is greater than or equal to a first preset distance threshold and less than or equal to a second preset distance.
Preferably, the determining unit 303 is configured to track the target object when the number of continuous light spot bits in the second shielding area is greater than or equal to a second preset number threshold.
Preferably, the motion state determining unit 304 is configured to determine, in real time, a motion state of the target object according to the position information of the second occlusion area.
Preferably, the motion state determining unit 304 determines, in real time, the motion state of the target object according to the position information of the second occlusion area, including:
if the number of the continuous light spot positions in the second shielding area is larger than or equal to a second preset number threshold value and no other shielding areas exist in the second area, determining that the target object is in a static state;
and if the number of the continuous light spot bits in the second shielding area is larger than or equal to a second preset number threshold value, and at least one shielding area comprising the number of the continuous light spot bits larger than or equal to the second preset number threshold value exists at the position of the number of the light spot bits which are horizontally spaced by at least a third preset number threshold value, determining that the target object is in a moving state.
Preferably, the first preset number threshold is 3, the second preset number threshold is 2, and the third preset number threshold is 1.
Preferably, wherein the system further comprises:
and the abnormal event determining unit is used for determining that an abnormal event exists in the monitoring area and sending abnormal alarm information to the control terminal when the number of the light spot positions in the first shielding area is larger than or equal to a first preset number threshold value and the horizontal distance between the first central point of the first shielding area and the second central point of the second shielding area is larger than or equal to a second preset distance threshold value.
The system 300 for determining a target object action state based on a light curtain according to an embodiment of the present invention corresponds to the method 100 for determining a target object action state based on a light curtain according to another embodiment of the present invention, and is not described herein.
The invention has been described with reference to a few embodiments. However, as is well known to those skilled in the art, other embodiments than the above disclosed invention are equally possible within the scope of the invention, as defined by the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a/an/the [ means, component, etc. ]" are to be interpreted openly as referring to at least one instance of said means, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. A method for determining an action state of a target object based on a light curtain, the method comprising:
acquiring a first light curtain signal in a first area and a second light curtain signal in a second area in real time, and determining a first shielding area and a second shielding area according to the first light curtain signal and the second light curtain signal in real time;
when the number of the light spot positions in the first shielding area is larger than or equal to a first preset number threshold value, and the horizontal distance between the first central point of the first shielding area and the second central point of the second shielding area is larger than or equal to a first preset distance threshold value and smaller than or equal to a second preset distance, determining that a target object in the monitoring area enters;
when the number of the continuous light spot positions in the second shielding area is larger than or equal to a second preset number threshold, tracking the target object;
and determining the action state of the target object according to the position information of the second shielding area in real time.
2. The method of claim 1, wherein determining the motion state of the target object in real time from the position information of the second occlusion region comprises:
if the number of the continuous light spot positions in the second shielding area is larger than or equal to a second preset number threshold value and no other shielding areas exist in the second area, determining that the target object is in a static state;
and if the number of the continuous light spot bits in the second shielding area is larger than or equal to a second preset number threshold value, and at least one shielding area comprising the number of the continuous light spot bits larger than or equal to the second preset number threshold value exists at the position of the number of the light spot bits which are horizontally spaced by at least a third preset number threshold value, determining that the target object is in a moving state.
3. The method of claim 2, wherein the first preset number threshold is 3, the second preset number threshold is 2, and the third preset number threshold is 1.
4. The method according to claim 1, wherein the method further comprises:
when the number of the light spot positions in the first shielding area is larger than or equal to a first preset number threshold value, and the horizontal distance between the first central point of the first shielding area and the second central point of the second shielding area is larger than or equal to a second preset distance threshold value, determining that an abnormal event exists in the monitoring area, and sending abnormal alarm information to the control terminal.
5. The method of claim 1, wherein the method uses a measurement grating to obtain the light curtain signal, and wherein the measurement grating measures a spot spacing of 3 cm.
6. A system for determining a state of motion of a target object based on a light curtain, the system comprising:
the shielding region determining unit is used for acquiring a first light curtain signal in the first region and a second light curtain signal in the second region in real time and determining a first shielding region and a second shielding region according to the first light curtain signal and the second light curtain signal in real time;
the target object confirmation unit is used for determining that a target object enters in the monitoring area when the number of light spot positions in the first shielding area is larger than or equal to a first preset number threshold value, and the horizontal distance between a first central point of the first shielding area and a second central point of the second shielding area is larger than or equal to a first preset distance threshold value and smaller than or equal to a second preset distance;
the judging unit is used for tracking the target object when the number of the continuous light spot positions in the second shielding area is larger than or equal to a second preset number threshold value;
and the action state determining unit is used for determining the action state of the target object according to the position information of the second shielding area in real time.
7. The system according to claim 6, wherein the action state determining unit determines the action state of the target object according to the position information of the second occlusion area in real time, including:
if the number of the continuous light spot positions in the second shielding area is larger than or equal to a second preset number threshold value and no other shielding areas exist in the second area, determining that the target object is in a static state;
and if the number of the continuous light spot bits in the second shielding area is larger than or equal to a second preset number threshold value, and at least one shielding area comprising the number of the continuous light spot bits larger than or equal to the second preset number threshold value exists at the position of the number of the light spot bits which are horizontally spaced by at least a third preset number threshold value, determining that the target object is in a moving state.
8. The system of claim 7, wherein the first preset number threshold is 3, the second preset number threshold is 2, and the third preset number threshold is 1.
9. The system of claim 6, wherein the system further comprises:
and the abnormal event determining unit is used for determining that an abnormal event exists in the monitoring area and sending abnormal alarm information to the control terminal when the number of the light spot positions in the first shielding area is larger than or equal to a first preset number threshold value and the horizontal distance between the first central point of the first shielding area and the second central point of the second shielding area is larger than or equal to a second preset distance threshold value.
10. The system of claim 6, wherein the system obtains the light curtain signal using a measurement grating, and wherein the measurement grating measures a spot spacing of 3 cm.
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